[Koha] Fatal Error in Acquisition

[shahas]

I am intalled 'Koha',,but I am getting error in Acquisition,when receiving
books.

Following error is getting when i click 'Save' button

please help me to proceed.

Koha error

The following fatal error has occurred:

Can't call method "subfield" on an undefined value at
/usr/share/koha/lib/C4/Biblio.pm line 2672.
Apache	Server version: Apache/2.2.21 (Linux/SUSE) Server built: 2012-02-14
Koha	4.02.00.006
Koha DB	4.0200006
MySQL	mysql Ver 14.14 Distrib 5.5.16, for Linux (i686) using readline 6.2
OS	Linux koha 3.1.9-1.4-desktop #1 SMP PREEMPT Fri Jan 27 08:55:10 UTC 2012
(efb5ff4) i686
Perl	5.014002

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